列车运行监控记录装置主机由A、B二组完全相同的控制单元组成，每组有（）个插件位置。
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You are underway in reduced visibility.You hear the fog signal of another vessel about 20° on your starboard bow.Risk of collision may exist.You should（）.
A. alter course to starboard to pass around the other vessel
B. reduce your speed to bare steerageway
C. slow your engines and let the other vessel pass ahead of you
D. alter course to port to pass the other vessel on its portside
额定功率是信号源所能发出的（）功率。
A. 最大
B. 最小
C. 0
定时器控制寄存器TCON的作用是控制定时器的（）、停止，标志定时器的溢出和中断情况。
由于墓地环境的特殊性，在一定地域内不能以道路为界限划分空间。
A. 正确
B. 错误
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